Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-02-01 Thread Andy Lutomirski
On 01/31/2013 12:52 PM, Alex Williamson wrote: > On Thu, 2013-01-31 at 22:00 +0200, Gleb Natapov wrote: >> On Thu, Jan 31, 2013 at 02:34:27PM -0500, Don Zickus wrote: >>> On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: >

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-02-01 Thread Andy Lutomirski
On 01/31/2013 12:52 PM, Alex Williamson wrote: On Thu, 2013-01-31 at 22:00 +0200, Gleb Natapov wrote: On Thu, Jan 31, 2013 at 02:34:27PM -0500, Don Zickus wrote: On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote:

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Alex Williamson
On Thu, 2013-01-31 at 22:00 +0200, Gleb Natapov wrote: > On Thu, Jan 31, 2013 at 02:34:27PM -0500, Don Zickus wrote: > > On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: > > > > http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf > > > > > > >

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Gleb Natapov
On Thu, Jan 31, 2013 at 02:34:27PM -0500, Don Zickus wrote: > On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: > > > http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf > > > > > > After talking with folks, the threat of irq injections on

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Don Zickus
On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: > > http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf > > > > After talking with folks, the threat of irq injections on virtual guests > > made sense. However, when discussing if this was

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Gleb Natapov
On Thu, Jan 31, 2013 at 11:40:35AM -0500, Don Zickus wrote: > In commit "41750d3 x86, x2apic: Enable the bios request for x2apic optout" > it was explained how OEMs are trying to opt out of using x2apics. > > That commit moved code around and screamed with a WARN if the BIOS > opted out of x2apic

[PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Don Zickus
In commit "41750d3 x86, x2apic: Enable the bios request for x2apic optout" it was explained how OEMs are trying to opt out of using x2apics. That commit moved code around and screamed with a WARN if the BIOS opted out of x2apic mode. Fair enough. This code hit our RHEL distro and OEMs started

[PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Don Zickus
In commit 41750d3 x86, x2apic: Enable the bios request for x2apic optout it was explained how OEMs are trying to opt out of using x2apics. That commit moved code around and screamed with a WARN if the BIOS opted out of x2apic mode. Fair enough. This code hit our RHEL distro and OEMs started

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Gleb Natapov
On Thu, Jan 31, 2013 at 11:40:35AM -0500, Don Zickus wrote: In commit 41750d3 x86, x2apic: Enable the bios request for x2apic optout it was explained how OEMs are trying to opt out of using x2apics. That commit moved code around and screamed with a WARN if the BIOS opted out of x2apic mode.

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Don Zickus
On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf After talking with folks, the threat of irq injections on virtual guests made sense. However, when discussing if this was possible on

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Gleb Natapov
On Thu, Jan 31, 2013 at 02:34:27PM -0500, Don Zickus wrote: On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf After talking with folks, the threat of irq injections on virtual guests

Re: [PATCH] x86, x2apic: Only WARN on broken BIOSes inside a virtual guest

2013-01-31 Thread Alex Williamson
On Thu, 2013-01-31 at 22:00 +0200, Gleb Natapov wrote: On Thu, Jan 31, 2013 at 02:34:27PM -0500, Don Zickus wrote: On Thu, Jan 31, 2013 at 08:52:00PM +0200, Gleb Natapov wrote: http://www.invisiblethingslab.com/resources/2011/Software%20Attacks%20on%20Intel%20VT-d.pdf After talking